Wood Column Capacity (Slenderness)
Slenderness ratio, column stability factor Cp, allowable Fc-prime, and allowable axial capacity for a solid rectangular sawn-lumber column via the NDS Cp / Euler buckling basis.
Formula and source
le/d governs (smaller dimension); FcE = 0.822*Emin/(le/d)^2; a = FcE/Fc*; c = 0.8 (sawn); Cp = (1+a)/(2c) - sqrt(((1+a)/(2c))^2 - a/c); Fc' = Fc**Cp; capacity = Fc'*b*d.
Per the NDS column-stability provisions (the Cp / Euler buckling basis), by name; reference design values user-supplied.
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